Desrespeitoso vs. desrespeitador
In Portuguese, both desrespeitoso and desrespeitador relate to a lack of respect, but they are not perfectly interchangeable. Desrespeitoso is the standard, everyday adjective used to describe rude behavior, comments, or attitudes. Desrespeitador is much less common, often sounds more formal or legalistic, and usually focuses on an agent (a person or entity) that actively violates specific laws, rules, or rights.
Desrespeitoso
B1This is the most common word for disrespectful. It describes the quality of an action, speech, or attitude that is rude, offensive, or lacks good manners. It focuses on the nature of the behavior.
O comentário dele foi muito desrespeitoso.
(His comment was very disrespectful.)
É desrespeitoso não ouvir quando alguém está falando.
(It is disrespectful not to listen when someone is speaking.)
Achei a atitude dela desrespeitosa com os mais velhos.
(I found her attitude disrespectful toward the elderly.)
Eles foram desrespeitosos durante a cerimônia.
(They were disrespectful during the ceremony.)
Não use esse tom desrespeitoso comigo.
(Do not use that disrespectful tone with me.)
Desrespeitador
C1This word functions as an adjective or a noun meaning one who respects nothing or viulator. It suggests an active agent breaking a rule, statute, or norm. It is often followed by de (of) to indicate what is being violated (e.g., laws, rights).
Ele é um motorista desrespeitador das leis de trânsito.
(He is a driver disrespectful of traffic laws.)
A empresa foi considerada desrespeitadora das normas ambientais.
(The company was considered disrespectful of environmental norms.)
Um governo desrespeitador dos direitos humanos sofrerá sanções.
(A government disrespectful of human rights will suffer sanctions.)
Ele se mostrou um cidadão desrespeitador da constituição.
(He proved himself to be a citizen disrespectful of the constitution.)
O grupo foi desrespeitador do acordo assinado.
(The group was disrespectful regarding the signed agreement.)
Summary
In summary, use desrespeitoso for almost all daily situations involving bad manners, insults, or rudeness. Use desrespeitador only in specific, formal contexts where you want to emphasize that someone is actively violating a serious code, law, or agreement.